Source code for bluepyopt.ephys.parameterscalers

"""Parameter scaler classes"""

Copyright (c) 2016, EPFL/Blue Brain Project

 This file is part of BluePyOpt <>

 This library is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser General Public License version 3.0 as published
 by the Free Software Foundation.

 This library is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

 You should have received a copy of the GNU Lesser General Public License
 along with this library; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# pylint: disable=W0511

import string

from bluepyopt.ephys.base import BaseEPhys
from bluepyopt.ephys.serializer import DictMixin

FLOAT_FORMAT = '%.17g'

[docs]def format_float(value): """Return formatted float string""" return FLOAT_FORMAT % value
[docs]class MissingFormatDict(dict): """Extend dict for string formatting with missing values""" def __missing__(self, key): # pylint: disable=R0201 """Return string with format key for missing keys""" return '{' + key + '}'
[docs]class ParameterScaler(BaseEPhys): """Parameter scalers""" pass
# TODO get rid of the 'segment' here
[docs]class NrnSegmentLinearScaler(ParameterScaler, DictMixin): """Linear scaler""" SERIALIZED_FIELDS = ('name', 'comment', 'multiplier', 'offset', ) def __init__( self, name=None, multiplier=1.0, offset=0.0, comment=''): """Constructor Args: name (str): name of this object multiplier (float): slope of the linear scaler offset (float): intercept of the linear scaler """ super(NrnSegmentLinearScaler, self).__init__(name, comment) self.multiplier = multiplier self.offset = offset
[docs] def scale(self, value, segment=None, sim=None): # pylint: disable=W0613 """Scale a value based on a segment""" return self.multiplier * value + self.offset
def __str__(self): """String representation""" return '%s * value + %s' % (self.multiplier, self.offset)
[docs]class NrnSegmentSomaDistanceScaler(ParameterScaler, DictMixin): """Scaler based on distance from soma""" SERIALIZED_FIELDS = ('name', 'comment', 'distribution', ) def __init__( self, name=None, distribution=None, comment='', dist_param_names=None): """Constructor Args: name (str): name of this object distribution (str): distribution of parameter dependent on distance from soma. string can contain `distance` and/or `value` as placeholders for the distance to the soma and parameter value respectivily dist_params (list): list of names of parameters that parametrise the distribution. These names will become attributes of this object. The distribution string should contain these names, and they will be replaced by values of the corresponding attributes """ super(NrnSegmentSomaDistanceScaler, self).__init__(name, comment) self.distribution = distribution self.dist_param_names = dist_param_names if self.dist_param_names is not None: for dist_param_name in self.dist_param_names: if dist_param_name not in self.distribution: raise ValueError( 'NrnSegmentSomaDistanceScaler: "{%s}" ' 'missing from distribution string "%s"' % (dist_param_name, distribution)) setattr(self, dist_param_name, None) @property def inst_distribution(self): """The instantiated distribution""" dist_dict = MissingFormatDict() if self.dist_param_names is not None: for dist_param_name in self.dist_param_names: dist_param_value = getattr(self, dist_param_name) if dist_param_value is None: raise ValueError('NrnSegmentSomaDistanceScaler: %s ' 'was uninitialised' % dist_param_name) dist_dict[dist_param_name] = dist_param_value # Use this special formatting to bypass missing keys return string.Formatter().vformat(self.distribution, (), dist_dict)
[docs] def eval_dist(self, value, distance): """Create the final dist string""" scale_dict = {} scale_dict['distance'] = format_float(distance) scale_dict['value'] = format_float(value) return self.inst_distribution.format(**scale_dict)
[docs] def scale(self, value, segment, sim=None): """Scale a value based on a segment""" # TODO soma needs other addressing scheme soma = segment.sec.cell().soma[0] # Initialise origin sim.neuron.h.distance(0, 0.5, sec=soma) distance = sim.neuron.h.distance(1, segment.x, sec=segment.sec) # Find something to generalise this import math # pylint:disable=W0611 #NOQA # This eval is unsafe (but is it ever dangerous ?) # pylint: disable=W0123 return eval(self.eval_dist(value, distance))
def __str__(self): """String representation""" return self.distribution